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代谢组学中数据采集及分析的研究进展
1999年,Nicholson等[1]首先提出了代谢组学(metabonomics)的概念并将其定义为:对生物系统因病理生理或基因改变等刺激所致动态多参数代谢应答的定量测定(the quantitative measurement of the dynam-ic multiparametric metabolic responses of living systems to pathophysiological stimuli or genetic modification).
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抗肝癌单链免疫毒素基因修饰的PBMCs在动物体内的抑瘤作用
目的:用携带分泌型抗肝癌单链免疫毒素基因(sFv-TNF-α)的重组逆转录病毒感染人外周血单个核细胞(peripheralblood mononuclear cells,PBMCs),使其表达并分泌针对人肝癌细胞的sFv-TNF-α融合蛋白,观察转导的PBMCs/PST静脉注射后对荷肝癌裸鼠的抑瘤作用.方法:分离正常人PBMCs并用PHA和IL-2进行体外刺激培养,用感染性重组病毒产生细胞C22(PA317/PST)产生的病毒上清转导后,经尾静脉输入荷肝癌裸鼠体内,注射细胞数为每只1×106(0.2 mL),每5 d注射1次,共注射3次.定期观察记录肿瘤生长情况,注射3次后处死,取出瘤组织称质量、记录,进行统计学处理,并制备石蜡切片进行常规HE染色及免疫组化染色观察.结果:实验组肿瘤生长速率为(20.8±4.9)mg/d,对照组为(28.5±6.7)mg/d,经t检验,P<0.05.结论:经重组逆转录病毒转导的PBMCs/PST在课鼠体内对人肝癌细胞系SMMC-7721移植瘤具有一定的生长抑制作用.
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There are several major pathological changes in Alzheimer’s disease, including apoptosis of cho-linergic neurons, overactivity or overexpression ofβ-site amyloid precursor protein cleaving enzyme 1 (BACE1) and inflammation. In this study, we synthesized a 19-nt oligonucleotide targeting BACE1, the key enzyme in amyloid beta protein (Aβ) production, and introduced it into the pSilenCircle vector to construct a short hairpin (shRNA) expression plasmid against the BACE1 gene. We transfected this vector into C17.2 neural stem cells and primary neural stem cells, resulting in downregulation of the BACE1 gene, which in turn induced a considerable reduction in reducing Aβprotein production. We anticipate that this technique combining celltransplantation and gene ther-apy wil open up novel therapeutic avenues for Alzheimer’s disease, particularly because it can be used to simultaneously target several pathogenetic changes in the disease.
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丙型肝炎基因修饰的树突状细胞疫苗研究
树突状细胞(dendritic cell,DC)在免疫反应中起着举足轻重的作用.我们利用融合基因修饰的树突状细胞作为疫苗在丙型肝炎细胞和动物模型中诱导出强烈的细胞和体液免疫反应.为提高基因疫苗诱导免疫应答的效率提供了新的手段,为丙型肝炎防治提供了新的思路和理论依据.
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pSVPoMcat微基因修饰雪旺细胞脊髓内移植对损伤脊髓细胞的保护作用
Objective To study the protective effects of the intracord transplantation of microgene pSVPoMcat- genetically- modified Schwann cells (MSCs)on spinal cord injury (SCI).Method Rats with semi- division(SD) of the spinal cord was divided into 4 groups.Group S consisted of the rats with SD treated with the transplantation of MSCs, Group B of the rats with SD treated with the transplantation of SCs without genetic modification,Group C of the rats with SD without treatment and Group D was the normal control. 8 hours after operation,the half of the rats of each group were killed and the injured segment of the spinal cord was resected to be examined with atomic absorption spectrophotometry . Another half of the rats of all the groups were examined with neurological function tests to have a combined behavioral score (CBS).Result There was a significant increase of water content and Na+ and Ca2+ ions and a decrease of K+ and Mg 2+ ions in the injured cord segment of Group C and a statistically significant recovery was observed in Group A. The intracord transplantation of pSVPoMcat genetically modidied SCs improved the neurological outcome of spinal cord injury.Conclusion Our findings indicate that intracord transplantation of pSVPoMcat- genetically- modified- Schwanncells exerts protective effects on the injured segment of the spinal cord through the improvement of the internal ion environment of the spinal cord.